<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			// 1. while
			var i = 0
			while (i < 5) {
				document.write("<h3>Hello world</h3>")
				i++
			}

			// 2. do-while
			var j = 0
			do {
				document.write("<h3 style='color:red'>Javascript</h3>")
				j++
			} while (j < 5)

			// 3. for语句
			for (var k = 0; k < 5; k++) {
				document.write("<h3 style='color:green'>for语句</h3>")
			}
		</script>

		<h1>乘法口诀表</h1>
		<script>
			document.write("<pre>");
			for (var i = 1; i <= 9; i++) {
				for (var j = 1; j <= i; j++) {
					document.write(j + "*" + i + "=" + (i * j) + "\t");
				}
				document.write("\n");
			}
			document.write("</pre>");
		</script>
	</body>
</html>
